Humidity How to measure Humidity Humidity is the amount of water vapour in the air and is expressed as a percentage (%). The instrument that we use to measure humidity is called a wet and dry bulb thermometer, also known as a hygrometer. Figure 1.1 A wet and dry bulb thermometer The wet and dry bulb thermometer consists of two normal thermometers that are exactly the same. These thermometers are mounted parallel to each other. Underneath one of the thermometers is a small bottle filled with distilled water. The bulb of this thermometer is covered with a small wick or cloth. The end of the wick hangs in the bottle with distilled water. ( see Figure 1.1). As the water rises up the wick, it evaporates causing the wet bulb thermometer to cool down, and to measure a lower temperature. The dry bulb thermometer will indicate the real air temperature. Watch video on how to measure humidity Sunshine How to measure sunshine Sunshine is measured with a Sunshine record...
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